<template>
  <el-menu
      default-active="1-4-1"
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose"
      :collapse="isCollapse"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
  >
    <h3>通用后台管理系统</h3>
    <el-menu-item
        v-for="item in noChildren"
        :key="item.name"
        :index="item.name"
        @click="clickMenu(item)"
    >
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>

    <el-submenu
        v-for="item in hasChildren"
        :key="item.label"
        :index="item.label"

    >
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item index="subItem.path" @click="clickMenu(subItem)">{{ subItem.label }}</el-menu-item>
      </el-menu-item-group>

    </el-submenu>
  </el-menu>
</template>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}

.el-menu {
  height: 100vh;

  h3 {
    color: #fff;
    text-align: center;
    line-height: 48px;
  }
}
</style>

<script>
export default {
  data() {
    return {
      menuData: [
        {
          path: "/",
          name: "home",
          label: "首页",
          url: "Home/home",
          icon: "s-home",
        },
        {
          path: "/mall",
          name: "mall",
          label: "商户管理",
          url: "MallManage/MallManage",
          icon: "video-play",
        },
        {
          path: "/user",
          name: "user",
          label: "用户管理",
          url: "UserManage/UserManage",
          icon: "user",
        },
        {
          label: "其他",
          icon: "location",
          children: [
            {
              path: "/page1",
              name: "page1",
              label: "页面1",
              url: "Other/PageOne",
              icon: "setting",
            },
            {
              path: "/page2",
              name: "page2",
              label: "页面2",
              url: "Other/PageTwo",
              icon: "setting",
            },
          ],
        },
      ],
      isCollapse: false,
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu(item) {
      //当前页面路径与即将跳转的路径不同时才跳转
      if (this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))) {
        this.$router.push(item.path)
      }
    }
  },
  computed: {
    //1.没有子菜单
    noChildren() {
      return this.menuData.filter((item) => !item.children);
    },
    //2.有子菜单
    hasChildren() {
      return this.menuData.filter((item) => item.children);
    },
  },
};
</script>
